after upgrading from helios to indigo, all my workspace projects seem to have lost their git decorations. Did i miss any precautions before updating?

In each of the Worspace project folders, the .git subdirectories are still there, and modifying the repository settings using Window -> Preferences -> Team -> Git -> Configuration -> Repository Settings works, too. Of course, i could remove all local repositories (this means: remove all git-enabled projects from workspace) and re-fetch them from our scm server, but it would be easier just to tell EGit to use the existing repositories. Is there a way to make EGit use the repository structure that's already present in the project folder?